.zhanting {
    position: relative;
    width: 100vw;
    height:100vh;
}
.zhanting-btn {
    position: absolute;
    top: 0;
    left: 0;
    background-color: transparent;
    border: none;
    cursor: pointer;
}
#zhanting {
    width: 100vw;
    height: 100vh;
    /* background-color: #d6d2d2; */
}
canvas {
    width: 100vw;
    height: 100vh;
}
